We found 5 dictionaries that include the word proo:

General (4 matching dictionaries)

1. proo: Collins English Dictionary [home, info]
2. proo: Wordnik [home, info]
3. PROO: Wikipedia, the Free Encyclopedia [home, info]
4. Proo: Rhymezone [home, info]

Miscellaneous (1 matching dictionary)

5. PROO: Acronym Finder [home, info]